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    Crossover large polaron - small polaron in the HTSC cuprates / I. A. Makarov [и др.] // V Междунар. конф. "Фундамент. пробл. высокотемп. сверхпров-ти" (ФПС'2015) : сборник расширенных тезисов . - М. : ФИАН, 2015. - Библиогр.: 3 назв.
   Перевод заглавия: Кроссовер большой полярон - малый полярон в ВТСП купратах

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Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Kozlov, P. A.; Козлов, Пётр Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; "Фундаментальные проблемы высокотемпературной сверхпроводимости", Международная конференция(5 ; 2015 ; окт. ; 5-9 ; Малаховка, Моск. обл.); Российская академия наук ; Физический институт им. П.Н. Лебедева РАН; Научный совет по физике конденсированного состояния РАН; Научный совет по физике низких температур РАН
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Dependence of the critical temperature of high-temperature superconductors on the hoppings and spin correlations between Cu02-planes / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneyder // Strongly Correlated Electronic Systems 2011 (SCES 2011) : Proceeding. - 2011

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; "Strongly Correlated Electronic Systems", Conf.(2011 ; 29th Aug. 3rd September ; Cambridge, UK)
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    Doping dependent band structure and pairing in strongly correlated electron systems of high-Tc cuprates / S. G. Ovchinnikov [и др.] // V International symposium on strong nonlinear vibronic and electronic interactions in solids : program, book of abstracts . - 2015. - Ст. O18. - P. 28. - Библиогр.: 1 назв.
   Перевод заглавия: Зависящие от допирования зонная структура и спаривание в системах с сильными электронными корреляциями ВТСП купратов

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Korshunov, M. M.; Коршунов, Максим Михайлович; Makarov, I. A.; Макаров, Илья Анатольевич; International symposium on strong nonlinear vibronic and electronic interactions in solids(5 ; 2015 ; May ; 1-3 ; Tartu)
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Effect of CuO2 lattice strain on the electronic structure and properties of high-Tc cuprate family / I. A. Makarov [et al.] // J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 7. - P. 1927-1935, DOI 10.1007/s10948-018-4936-9. - Cited References: 51. - We thank the Presidium RAS program No.12 “Fundamental problems of high temperature superconductivity” for the financial support under the project 0356-2018-0063. The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project:“Features of electron-phonon coupling in high-temperature superconductors with strong electronic correlations” No. 18-42-240017. This work was done under the State contract (FASO) No. 0389-2014-0001 and supported in part by RFBR grants No. 17-02-00015 and 18-02-00281. . - ISSN 1557-1939
Кл.слова (ненормированные):
Cuprate superconductors -- CuO2 lattice strain -- Strong electronic correlations -- Hubbard model -- Electronic structure -- Lifshitz transitions
Аннотация: Doping and strain dependences of the electronic structure of the CuO6-octahedra layer within LDA+GTB method in the frameworks of six-band p-d model are calculated. Band structure and Fermi surface of the quasiparticle excitations in the effective Hubbard model are characterized by inhomogeneous distribution of the k-dependent spectral weight. Doping results in reconstruction of the band structure, redistribution of the spectral weight over dispersion surface, and reconstruction of Fermi surface from small hole pockets in the underdoped region to large hole contour in the overdoped region through two quantum phase transitions (QPT). Strain increasing leads to displacement of the valence and conductivity bands, bandwidths decreasing, and shift of the concentrations corresponding to QPTs. Strain dependences of the antiferromagnetic exchange coupling and DOS at the Fermi level determining superconducting temperature Tc are obtained. Effective exchange coupling in the equation for Tc demonstrates monotonic strain dependence.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute for Electrophysics, Russian Academy of Sciences, Ural Branch, Ekaterinburg, 620016, Russian Federation
Rome International Center for Materials Science Superstripes (RICMASS), Roma, 00185, Italy
CNR-IC, Istituto di Cristallografia, Monterotondo, Roma, 00015, Italy
National Research Nuclear University, MEPhI, Moscow, 115409, Russian Federation

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Shneyder, E. I.; Шнейдер, Елена Игоревна; Nekrasov, I. A.; Slobodchikov, A. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Bianconi, A.
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    Effects of electron-phonon interaction in strongly correlated copper oxides systems within alternative versions of generalized tight-binding method / E. I. Shneyder [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. O2.1. - P. 135. - References: 3. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support . - ISBN 978-5-904603-06-9
   Перевод заглавия: Эффекты электрон-фононного взаимодействия в медных оксидах с сильными электронными корреляциями в рамках альтернативных версий обобщенного метода сильной связи
Кл.слова (ненормированные):
electron-phonon interaction -- strongly correlated electron systems

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Makarov, I. A.; Макаров, Илья Анатольевич; Zotova, M. V.; Зотова, Мария Владимировна; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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Electronic structure and minimal models for flat and corrugated CuO monolayers: An ab initio study / A. A. Slobodchikov, I. A. Nekrasov, L. V. Begunovich [et al.] // Materials. - 2023. - Vol. 16, Is. 2. - Ст. 658, DOI 10.3390/ma16020658. - Cited References: 24. - This research was in part funded by the Russian Science Foundation grant number 23-22-00372 . - ISSN 1996-1944
Кл.слова (ненормированные):
CuO monolayer -- band structure -- DFT -- minimal orbital model -- Wannier functions projections
Аннотация: CuO atomic thin monolayer (mlCuO) was synthesized recently. Interest in the mlCuO is based on its close relation to CuO2 layers in typical high temperature cuprate superconductors. Here, we present the calculation of the band structure, the density of states and the Fermi surface of the flat mlCuO as well as the corrugated mlCuO within the density functional theory (DFT) in the generalized gradient approximation (GGA). In the flat mlCuO, the Cu-3dx2−y2 band crosses the Fermi level, while the Cu-3dxz,yz hybridized band is located just below it. The corrugation leads to a significant shift of the Cu-3dxz,yz hybridized band down in energy and a degeneracy lifting for the Cu-3dx2−y2 bands. Corrugated mlCuO is more energetically favorable than the flat one. In addition, we compared the electronic structure of the considered CuO monolayers with bulk CuO systems. We also investigated the influence of a crystal lattice strain (which might occur on some interfaces) on the electronic structure of both mlCuO and determined the critical strains of topological Lifshitz transitions. Finally, we proposed a number of different minimal models for the flat and the corrugated mlCuO using projections onto different Wannier functions basis sets and obtained the corresponding Hamiltonian matrix elements in a real space.

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Держатели документа:
Institute of Electrophysics, Russian Academy of Sciences, Ural Branch, 620016 Yekaterinburg, Russia
Federal Research Center KSC SB RAS, Akademgorodok, 660036 Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Slobodchikov, Anatoly A.; Nekrasov, Igor A.; Begunovich, L. V.; Бегунович, Людмила Витальевна; Makarov, I. A.; Макаров, Илья Анатольевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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    Influence of CuO2 lattice strain on the electronic structure of high-Tc cuprate family / I. A. Makarov [et al.] // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст. I.P12. - P. 157-158. - Cited References: 4. - We thank the Presidium RAS program No.12 for the financial support under the project 0356-2018-0063. The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project:”Features of electron-phonon coupling in high-temperature superconductors with strong electronic correlations” No. 18-42-240017. This work was done under the State contract (FASO) No. 0389-2014-0001 and supported in part by RFBR grants No. 17-02-00015 and 18-02-00281 . - ISBN 978-5-9500855-7-4
   Перевод заглавия: Влияние параметра решетки CuO2-слоя на электронную структуру семейства ВТСП купратов

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Institute of Electrophysics of Ural Division of Russian Academy of Sciences, Ekaterinburg, Russia
Rome International Center for Materials Science Superstripes (RICMASS), Roma, Italy; CNR-IC, Istituto di Cristallografia

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Makarov, I. A.; Макаров, Илья Анатольевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Shneider, E. I.; Шнейдер, Елена Игоревна; Nekrasov, I. A.; Slobodchikov, A. A.; Ovchinnikov, S. G.; Bianconi, A.; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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    Influence of orthorhombic deformations in CuO2 plane on the electronic structure of high-Tc cuprate family / I. A. Makarov [et al.] // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст. I.O1. - P. 114-115. - Cited References: 4 . - ISBN 978-5-9500855-7-4
   Перевод заглавия: Влияние орторомбических деформаций в CuO2 плоскости на электронную структуру семейства ВТСП купратов

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Institute of Electrophysics of Ural Division of Russian Academy of Sciences, Ekaterinburg, Russia
Rome International Center for Materials Science Superstripes (RICMASS), Roma, Italy; CNR-IC, Istituto di Cristallografia

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Makarov, I. A.; Макаров, Илья Анатольевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Shneider, E. I.; Шнейдер, Елена Игоревна; Nekrasov, I. A.; Pavlov, N. S.; Ovchinnikov, S. G.; Bianconi, A.; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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    Influence of the diagonal and off-diagonal electron-phonon interactions on the formation of local polarons and their band structure in materials with strong electron correlations / E. I. Shneyder [et al.] // J. Exp. Theor. Phys. - 2018. - Vol. 126, Is. 5. - P. 683-698, DOI 10.1134/S1063776118050059. - Cited References: 58. - We are grateful to V.I. Zinenko and V.A. Gavrichkov for useful discussions. This work was financially supported by the Russian Foundation for Basic Research (project no. 16-02-00098) and the Basic Research Program no. 12 of the Presidium of the Russian Academy of Sciences ("Fundamental Problems of High-Temperature Superconductivity"). . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   D-WAVE SUPERCONDUCTIVITY
   LATTICE
Аннотация: For systems with strong electron correlations and strong electron–phonon interaction, we analyze the electron–phonon interaction in local variables. The effects of the mutual influence of electron–electron and electron–phonon interactions that determine the structure of local Hubbard polarons are described. Using a system containing copper–oxygen layers as an example, we consider the competition between the diagonal and off-diagonal interactions of electrons with the breathing mode as the polaron band structure is formed within a corrected formulation of the polaron version of the generalized tight-binding method. The band structure of Hubbard polarons is shown to depend strongly on the temperature due to the excitation of Franck–Condon resonances. For an undoped La2CuO4 compound we have described the evolution of the band structure and the spectral function from the hole dispersion in an antiferromagnetic insulator at low temperatures with the valence band maximum at point (π/2, π/2) to the spectrum with the maximum at point (π, π) typical for the paramagnetic phase. The polaron line width at the valence band top and its temperature dependence agree qualitatively with angle-resolved photoemission spectroscopy for undoped cuprates.

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Публикация на русском языке Влияние диагонального и недиагонального электрон-фононных взаимодействий на формирование локальных поляронов и их зонной структуры в веществах с сильными электронными корреляциями [Текст] / Е. И. Шнейдер [и др.] // Журн. эксперим. и теор. физ. - 2018. - Т. 153 Вып. 5. - С. 820-837

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr,Siberian Branch, Akad Gorodok 50, Krasnoyarsk 660036, Russia.
Federal State Autonomous Higher-Education Enterprise Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Makarov, I. A.; Макаров, Илья Анатольевич; Zotova, M. V.; Зотова, Мария Владимировна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [16-02-00098]; Basic Research Program of the Presidium of the Russian Academy of Sciences [12]
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10.

Kozlov, P. A.
Transition Between Large and Small Polaron States in the Electronic Structure of HTSC Cuprates / P. A. Kozlov, I. A. Makarov, S. G. Ovchinnikov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P2.11. - P. 153. - References: 3 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
cuprates -- strong electron correlations -- electron-phonon interaction -- polaron -- Franck-Condon

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Козлов, Пётр Александрович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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11.

    Magnetic mechanisms of pairing in strongly correlated electron system of copper oxides / S. G. Ovchinnikov [et al.] // arXiv. - 2015. - Ст. eprint arXiv:1510.08640. - Cited References: 214. - The authors acknowledge support from FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 16.740.12.0731 and GK 16.740.11.0740), RFBR (Grants 12-02-31534 and 12-02-31597), Siberian Federal University (Theme #F-11), Governmental support of leading scientific schools of Russia (NSh-1044.2012.2), Program of SB RAS #44, Presidium of RAS program #20.7. EIS, IAM, and MMK are grateful to The Dynasty Foundation and ICFPM forthe financial support. - In book.: Recent advances in superconductivity research", ed. by C.B. Taylor, 321 p., Nova Science Publishers Inc. New York, 2013 ISBN: 978-1-62618-406-0, Chapter 6
Рубрики:
Condensed matter--Strongly correlated electrons
   Superconductivity
Кл.слова (ненормированные):
strong electronic correlations -- cuprates -- Hubbard operators -- electronic structure -- quantum phase transitions -- magnetic mechanism of pairing
Аннотация: The multielectron LDA+GTB approach has been developed to calculate electronic structure of strongly correlated cuprates. At low energies the effective Hamiltonian of the t−t′−t"−t⊥−J∗−J⊥-model has been derived with parameters coming from the ab initio calculation for LSCO. The electronic structure of LSCO has been calculated self-consistently with the short-range antiferromagnetic order for various doping level. Two Lifshitz-type quantum phase transitions with Fermi surface topology changes have been found at dopings xc1=0.15 and xc2=0.24. Its effect on normal and superconducting properties has been calculated. The interatomic exchange parameter and its pressure dependence has been calculated within LDA+GTB scheme. The magnetic mechanisms of d-wave pairing induced by static and dynamical spin correlations are discussed. Simultaneous treatment of magnetic and phonon pairing results in the conclusion that both contributions are of the same order. For two layer cuprates like YBCO the interlayer hopping and exchange effects on the electronic structure and doping dependence of Tc is discussed as well as the Coulomb interaction induced mechanism of pairing.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Togushova, Yu.N.; Тогушова Ю.Н.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Korshunov, M. M.; Коршунов, Максим Михайлович
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12.

    Magnetic mechanisms of pairing in strongly correlated electron system of copper oxides / S. G. Ovchinnikov, I. A. Makarov, E. I. Shneyder [et al.] ; ed. C. B. Taylor // Recent advances in superconductivity research. - New York : Nova Science Publishers, 2013. - Chapter 6. - P. 93-143 . - ISBN 978-1-62618-406-0
   Перевод заглавия: Магнитные механизмы спаривания в сильно коррелированной системе оксидов меди
Кл.слова (ненормированные):
strong electronic correlations -- magnetic mechanism of pairing -- quantum phase transitions -- electronic structure -- Hubbard operators -- cuprates
Аннотация: The multielectron LDA+GTB approach has been developed to calculate electronic structure of strongly correlated cuprates. At low energies the effective Hamiltonian of the t- t’- t”- t﬩-J*-J﬩ -model has been derived with parameters coming from the ab initio calculation for LSCO. The electronic structure of LSCO has been calculated self-consistently with the short-range antiferromagnetic order for various doping level. Two Lifshitz-type quantum phase transitions with Fermi surface topology changes have been found at dopings x(c1) = 0.15 and x(c2) = 0.24. Its effect on normal and superconducting properties has been calculated. The interatomic ex change parameter and its pressure dependence has been calculated within LDA+GTB scheme. The magnetic mechanisms of d-wave pairing induced by static and dynamical spin correlations are discussed. Simultaneous treatment of magnetic and phonon pairing results in the conclusion that both contributions are of the same order. For two layer cuprates like YBCO the interlayer hopping and exchange effects on the electronic structure and doping dependence of Tc is discussed as well as the Coulomb interaction induced mechanism of pairing.

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Togushova, Yu. N.; Тогушова Ю. Н.; Korshunov, M. M.; Коршунов, Максим Михайлович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Taylor, C. B. \ed.\
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13.

Makarov, I. A.
Cooperative effect of doping and temperature on the polaronic band structure in strongly correlated electron systems with strong electron-phonon interaction / I. A. Makarov, S. G. Ovchinnikov. - Electronic text data // ArXiv. - 2016. - Ст. 1612.02781. - Cited References: 22. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support.
Аннотация: In this work we investigate doping and temperature dependences of electronic structure of system with strong electronic correlations and strong electron-phonon interaction modeling cuprates in the frameworks of the three-band p-d-Holstein model by a polaronic version of the generalized tight binding (GTB) method. Within this approach the electronic structure is formed by polaronic quasiparticles constructed as excitations between initial and final polaronic multielectron states. Doping and temperature effects are taken into account by occupation numbers of local excited polaronic states and variations in the magnitude of spin-spin correlation functions. Both effects are manifested in the reconstruction of band structure, Fermi contours, density of states and redistribution of the spectral weight over the Hubbard polaron subbands. Doping leads to transformation of Fermi contour from small hole pockets around k=(π/2,π/2) with inhomogeneous spectral weight distribution at small hole concentration to large contour around k=(π,π) in the overdoped compound as a result of two quantum phase transitions. In the system with phonon subsystem and EPI doping results in the top of the valence band splitting off and new polaron subbands appearance. Temperature increasing in the system with doped holes and moderate EPI leads to formation of the flatband around k=(π,π) and transfer of the spectral weight to the splitted off top of the valence band.

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Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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14.

Makarov, I. A.
Dependence of the critical temperature of high-temperature cuprate superconductors on hoppings and spin correlations between CuO2 planes / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneider // J. Exp. Theor. Phys. - 2012. - Vol. 114, Is. 2. - P. 329-342, DOI 10.1134/S1063776112020264. - Cited References: 73. - This study was supported in part by the Presidium of the Russian Academy of Sciences (program "Quantum Physics of Condensed Media," project no. 18.7), jointly by the Siberian and Ural branches of the Russian Academy of Sciences (integration projects project no. 40), the Russian Foundation for Basic Research (project no. 09-02-00127), the Presidential Program in Support of Young Scientists in Russia (project no. MK-1683.2010.2), and the federal target program "Specialists" (project no. P891). One of the authors (E.I.Sh.) gratefully acknowledges support from the nonprofit Dynasty foundation. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   BAND HUBBARD-MODEL
   SINGLE-CRYSTALS
   TRANSITION-TEMPERATURE
   FERMI-SURFACE
   DOPING DEPENDENCE
   THERMAL-EXPANSION
   COPPER OXIDES
   ANISOTROPY
   LA2-XSRXCUO4
Аннотация: The influence of interlayer hoppings on the superconducting transition temperature (T c) in bilayer cuprates has been studied. The parameter of hopping between layers is expressed as t ⊥(k) = t ⊥(cos(k x ) − cos(k y ))2 and treated as a small perturbation for the states of two CuO2 planes described by the t-t′-t″-J* model. In the generalized mean field approximation for dx2−y2{d_{{x. } - {y. }}} symmetry of the superconducting gap, neither the interlayer hopping or exchange interaction, nor the pair hopping between CuO2 layers provides an additional mechanism of Cooper pair formation or an increase in T c. In the concentration dependence of T c, the bilayer splitting of the upper Hubbard band of quasi-holes is manifested as two peaks with temperatures slightly lower than the maximum T c for a single-layer cuprate. Interlayer antiferromagnetic spin correlations suppress bilayer splitting.

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Публикация на русском языке Макаров, Илья Анатольевич. Зависимость критической температуры высокотемпературных сверхпроводников от перескоков и спиновых корреляций между CuO2-плоскостями [Текст] / И. А. Макаров, С. Г. Овчинников, Е. И. Шнейдер // Журн. эксперим. и теор. физ. : Наука, 2012. - Т. 141 Вып. 2. - С. 372-386

Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.
Shneider, E. I.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Makarov, I. A.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneider, E. I.] Reshetnikov Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneider, E. I.; Шнейдер, Елена Игоревна; Макаров, Илья Анатольевич
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15.

    Makarov, I. A.
    Doping dependence of the electronic structure of polaronic excitations in the HTSC cuprates / I. A. Makarov, S. G. Ovchinnikov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P2.9. - P. 151. - References: 1. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support . - ISBN 978-5-904603-06-9
   Перевод заглавия: Концентрационная зависимость электронной структуры поляронных возбуждений в ВТСП купратах
Кл.слова (ненормированные):
cuprates -- strong electron correlations -- electron-phonon interaction -- polaron

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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16.

Makarov, I. A.
Effect of electron-phonon interaction on the doping and temperature depended spectral function in cuprates / I. A. Makarov, S. G. Ovchinnikov // Superstripes 2017 : [absrtacts] / ed. A. Bianconi : Superstripes press, 2017. - Ст. 37.1. - P. 206. - (Science Series ; Vol. 11) . - ISBN 9788866830696
Аннотация: The generalized tight binding (GTB) method to calculate the electronic structure of strongly correlated electrons in cuprates is modified to incorporate also strong electronphonon interaction. By exact diagonalization of the p-d- Holstain model Hamiltonian for a separate CuO6 unit cell we find the multelectron and multiphonon local eigenstates that are used to construct a set of local Hubbard operators. Then we treat the intercell electron hopping t by the perturbation approach over small ratio t/U, where U is the charge transfer excitation energy. Without electron-phonon interaction we obtain the band of spin polaron and a set of local multiphonon Franck-Condon excitations. The electron-phonon interaction results in the hybridization of spin polaron and Franck Condon excitations that forms the polaronic band structure with strong temperature dependence. The temperature dependence of the polaronic band structure and Fermi surface is discussed. The peak of a spectral function at the top of the valence band has large width typical to the ARPES data and determined by a large number of the multiphonon excitations.

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Доп.точки доступа:
Bianconi, A. \ed.\; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич; International Conference on Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity(2017 ; June 5-10 ; Ischia, Italy); Superstripes 2017. Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity(2017 ; June 5-10 ; Ischia, Italy)
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17.

Makarov, I. A.
Effect of Interlayer Single-Particle Hoppings on the Superconducting Transition Temperature / I. A. Makarov, S. G. Ovchinnikov // JETP Letters. - 2011. - Vol. 93, Is. 6. - P. 339-343, DOI 10.1134/S0021364011060063. - Cited References: 27. - This work was supported by the Presidium of the Russian Academy of Sciences (program no. 18.7 "Quantum Physics of Condensed Matter"), by the Siberian and Ural Branches of the Russian Academy of Sciences (joint project no. 40), by the Russian Foundation for Basic Research (project no. 09-02-00127), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-1683.2010.2), and by the Ministry of Education and Science of the Russian Federation (project no. GK P891, federal program "Scientific and Pedagogical Personnel of Innovative Russia"). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   DEPENDENCE
   YBA2CU3O7-DELTA
   ELECTRON
   SPECTRUM
   STRESS
Аннотация: It is well known that the superconducting transition temperature of high-T-c cuprates depends on the number of CuO2 planes in the unit cell. The multilayer structure implies the possibility of interlayer hopping. Under the assumption that the interlayer hopping can be specified by the parameter t(perpendicular to)(k) = t(perpendicular to)(cos(k(x)) - cos(k(y)))(2), the quasiparticle excitation spectrum for the bilayer cuprate in the superconducting state has been determined in the framework of the t - t' - t '' - t(perpendicular to) - J* model using the generalized mean-field approximation. It turns out that the interlayer hoppings does not create any additional mechanism of the Cooper paring and does not lead to an increase in T-c. The splitting of the upper Hubbard quasiparticle band attributed to the interlayer hoppings is manifested as two peaks in the doping dependence of the superconducting transition temperature at temperatures below the maximum T-c value for a single-layer cuprate. It has been found that antiferromagnetic interlayer correlations suppress the interlayer splitting. This probably leads to the common doping dependence of T-c for both single-layer and bilayer cuprates.

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Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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18.

Makarov, I. A.
Effect of orthorhombicity on the electronic structure and superconducting properties of high-Tc cuprate family / I. A. Makarov, S. G. Ovchinnikov // J. Supercond. Novel Magn. - 2021. - Vol. 34, Is. 10. - P. 2503-2515, DOI 10.1007/s10948-021-05915-w. - Cited References: 73. - We would like to especially thank A. Bianconi for new ideas, useful discussions, and suggestions. We thank D.M. Dzebisashvili, I.A. Nekrasov, and A.A. Slobodchikov for valuable advice and useful discussions. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project ”Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials” No. 20-42-240016 . - ISSN 1557-1939
Кл.слова (ненормированные):
Cuprate superconductors -- Orthorhombic distortion -- Strong electronic correlations -- Hubbard model -- Electronic structure -- Concentration dependence of Tc
Аннотация: Electronic structure in the normal state and properties in the superconducting state of the orthorhombic phase in HTSC cuprates are studied within the multielectron generalized tight-binding (GTB) approach. The joint effect of variation of average Cu-O distance and orthorhombic distortion on the Fermi contour, band structure, and concentration dependence of Tc is studied. Quasiparticle excitations were constructed within the framework of the five-band p-d model for the layer of the CuO6 octahedra. The electronic structure of quasiparticle excitations in the effective Hubbard model is calculated using the equation of motion for Green’s functions in the generalized mean-field approximation. Orthorhombic distortion leads to asymmetric with respect to the nodal direction of the Brillouin zone dispersion surface of quasiparticle excitations and to splitting of each van Hove singularity into two peaks. Transformation of the Fermi contour from hole pockets to the large hole and electron pockets occurs as a result of two quantum-phase transitions at dopings xc1 and xc2. Simultaneous average Cu-O distance elongation and orthorhombic distortion decreasing result in Tc decrease. Tc dependence on average Cu-O distance in the orthorhombic phase is in agreement with the behavior of experimental Tcmax values when the DOS effect on Tc prevails over the effect of the exchange parameter. There are two Tc maxima in the orthorhombic system with the suppressed exchange parameter, and these maxima appear at concentrations xc1 and xc2.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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19.

    Makarov, I. A.
    Enhanced s*-wave component of the superconducting gap in overdoped HTSC cuprates with orthorhombic distortion / I. A. Makarov, S. G. Ovchinnikov // Phys. Lett. A. - 2022. - Vol. 444. - Ст. 128226, DOI 10.1016/j.physleta.2022.128226. - Cited References: 67. - We would like to especially thank A. Bianconi for new ideas, useful discussions, and suggestions. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project “Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials” No. 20-42-240016 . - ISSN 0375-9601
   Перевод заглавия: Увеличенная s*-волновая компонента сверхпроводящей щели в передопированных ВТСП купратах с орторомбическим искажением
Кл.слова (ненормированные):
High-Tc superconductors -- Orthorhombic cuprates -- Hubbard model -- Superconductivity theory -- Fermi contour -- Superconducting gap symmetry
Аннотация: In this work, the concentration and temperature dependence of the superconducting gap of the HTSC cuprate in the orthorhombic phase are obtained within the framework of the Hubbard model taking into account the exchange mechanism of pairing. To elucidate the reasons for the unexpectedly large s*-wave component of the superconducting gap in the overdoped regime, the electronic structure of low-energy excitations and the k-dependent contributions of pair states to the gap components were investigated. It is shown that the s*-wave component growth results from the shallowing of the electron pocket in the region of the s*-wave component maximum.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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20.

Makarov, I. A.
Reconstruction of the Fermi surface of HTSC cuprates in a high magnetic field / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneider // JETP Letters. - 2009. - Vol. 89, Is. 12. - P. 632-637, DOI 10.1134/S002136400912008X. - Cited References: 19. - This work was supported by the Russian Foundation for Basic Research (project no. 09-02-00127), the Siberian Branch and the Ural Division, Russian Academy of Sciences (integration project no. 40), and the Presidium of the Russian Academy of Sciences (program no. 5.7). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   COPPER OXIDES
   ELECTRON
   SPECTRUM
   BAND
Аннотация: The effect of a high magnetic field on the electronic structure of HTSC cuprates is considered. The study is performed in the t-t'-taEuro(3)-J* model, and the high magnetic field effect is taken into account not only as the Zeeman splitting of the one-electron levels, but also in the occupation numbers of the states with different spin projections and in the formation of the spin correlation functions. The field is assumed to be high enough to align all of the spins along the field. As a result, the Fermi surface reconstruction is obtained from four hole pockets about the nodal point (pi/2, pi/2) in the paramagnetic phase to a large hole pocket about the point (pi, pi) in the ferromagnetic phase. As the magnetic field strength decreases, a number of quantum phase transitions are revealed; they are manifested in the changed Fermi surface topology. The Fermi surface reconstruction with a decreasing field is qualitatively the same as that with an increasing doping degree in the absence of a magnetic field.

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Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.
Shneider, E. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneider, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneider, E. I.; Шнейдер, Елена Игоревна; Макаров, Илья Анатольевич; Russian Foundation for Basic Research [09-02-00127]; Siberian Branch and the Ural Division, Russian Academy of Sciences [40]; Presidium of the Russian Academy of Sciences [5.7]
}
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